ORIENTATION OF THE EAR VESICLE 



21 



transplanted vesicle is not exactly comparable to that of the 

 normal side. The greatest obstacle, however, is deviation from 

 the normal development in the transplanted vesicles, especially 

 in regard to form and the relative thickness of the walls. In 

 some cases the vesicles are quite round instead of oval in shape, 

 and the walls retain a uniform thickness. 



For the sake of brevity, the results of my study are herewith 

 given in the form of a table (table 1). By ^complete rotation' is 

 meant that the ear vesicle, which had been transplanted in an 

 inverted posture, had turned back and regained its normal 



TABLE 1 



position. ^Half rotation' implies that the vesicle rotated to 

 some extent only. Differences in thickness of the vesicle walls, 

 the general form of the vesicle, etc., are considered under ^Ef- 

 ficient criteria. ' ' No vesicle ' covers the case in which the vesicle 

 slipped out from the transplanted area and hence was lost. By 

 ^ Other circumstances' are designated those factors which made 

 further study of the specimen impossible, such as improper treat- 

 ment of the material, disassociation of the vesicle, etc. 



As shown in table 1, fifteen specimens were examined at 

 various intervals, from fifteen minutes to five and one-half 

 hours after the operation. The ear vesicles were found still 



